Method of forming reinforced bearings.



W. H. LUHRS METHOD OF FORMING REINFORCED BEARINGS. APPLICATION FILEDAPR. 23, I915. 1,185,220

Patented May 30, 1916.

; Snow doc 77222 2am J7, [V2225 Witueooen iiITEI STATES WILLIAM H. LUIIRS. OF D 'E METHOD OF FORMING Specification of Letters-Patent. I

Application filed April 23.

To all whom it may concern:

Be it l(ll()\\'ll that I. 'umn'ii ll. Ltfuns. a citizen of the InitedStates of America. residing at Detroit. in the county of 'ayne and Stateof Michigan. have invented certain new and useful Improvements inMethods of Forming Reinforced Bearings. of which the following is aspecification. reference being bad therein to the accompanying drawings.

The invention relates to the manufacture of bearings which are providedwith babbitted or soft metal wearing surfaces. and it is the object ofthe invention to reduce the cost of manufacture and at the same time toobtain a product which is more durable than those heretofore used.

In the construction of babbitted bearings it is usual to producesufficient depth of the Babbitt metal to con'ipensate for wear. but inaddition to this it is also usual to provide a much greater depth toincrease the strength of the bearing. This is for the reason that thefriction upon the bearing surface will tend to displace the metal inrelation to the outer case and unless there is sufficient body to resistthese stresses the liabbitt lining may become detached. therebydestroying the bearing. \Yith certain coir structions the babbitt ismechanically united to its holder by perforating the latter so as toform interlocking studs. but the union is an imperfect one and sooner orlater the soft metal becomes loosened and is eventually destroyed. Thusto guard against such a result the depth of the soft metal is madegreater than would be required for merely compensating for wear. 'iththe present invention I have obtained a greatly improved bearing. first.by reinforcing the soft metal with a rigid metal, such as steel, andsecond. by integrating the contacting surfaces of the soft and hardermetal so that they becon'ie in effect. a unit. and the depth of the softmetal may therefore be restricted to that necessary for wear. L

In (cu-r ng out my improved process for Ili5"'.ilu\'[li 'ing bearings itis essentiaLfirst. m prepare the surface of the reinforcing metal sothat it will beintegrated with the soft or Babbitt metal. This Ipreferably accomplish by subjecting the reinforcing metal to a series oftreatments preliminary to a mn oi 'r. MICHIGAN REINFORCED vBEARINGS.

Patented name. 1916. 1915. sci-m1 No. 23.315. 7

tinning process by which the surface is coatwlwith metallic tin. Afterthe tinning process the reinforcement is heated to a predeterminedtemperature. and the Babbitt metal is then cast thereupon. with a resultthat it will be completely molecularly united with the reinforcement andwill become a unit therewith. i i

In the drawings. I have illustrated a few of the specific forms ofbearing resulting from my process, in which Figure l is a perspectiveview showing one construction. and Fig. 2 a longitudinal section througha modified construction and Fig. 3 shows in longitudinal section themost simple form of the invention.

is the metallic reinforcement. preferably formed of sheet steel. pressedor otherwise fashioned into the desired form. This reinforcement isfirst treated by dipping the same in a solution of substantially thefollowing composition: 100 pounds of IIIIIII? atic acid.l ounce ofsalamnroniac,cut with 2 ounces of aluminum. The reinforcement beingfirst heated to a tempe atnre of 200 F.. is then plunged into thissolution and is allowed to cool. The next-treatment is the immersing ofthe pre-heated metal in a solution composed of substantially: 100 poundsof muriatic acid. cut with 5 ounces of zinc. After immersing in thissolution the bearing is again allowed to .cool. The next treatment isthe immersing of the pre-heated metal in a solution composed of: 100pounds of muriatic acid and 8 ounces of zinc. and

after witlnlrawing from the solution the pletely coated with tin. Thereinforcement is then-permitted to cool, after which it is re-heated tosubstantially 450" F.. and is then assembled in proper position fofcasting the Babbitt metal thereon.

-\s shown in Fig. 1. the Babbitt metal is cast so as to have aportion 1) extending parallel to the reinforcement A. and portions andextending around the end of said reinforcement. Thus the wearing.surface for both radial and end thrust is formed of the softer metal.

In Fig. 2 a modified construction shown. in which fianges ll are unitedto the tin sur face of the ends of the reinforcement A, and

the babbitt Eds cast to extend parallel to manufacture of ariousspecific structures.

'hat I claim as my invention is 1. The process of forming reinforcedBahhitt orsoft metalbearings. comprising the treatmentof the reinforcingmetal to a series of acid baths having small proportions of metallicsalts therein, the plunging of the metal after treatment into a moltentin bath. and the casting of the hahhitt upon the tin. surfaceto becomemolecularly united thereto.

2. The process of forming reinforced Babbitt or soft metal hearings,comprising the treatment of the reinforcing metal by first innnersiug ina bath of 'muriatic acid and aluminum salt, second. in in'unersing in abath of muriatic 101d and zinc. salt, third;

in immersing in a bath of muriatic acid with a greater proportion ofzinc salt. fourth, in innuersing in molten tin. and fifth. in castingthe Bahbitt metal upon the tin surface to become molecularly unitedthereto.

3. The process of forming reinforced Rab bitt or soft metal hearings,comprising the treatment of the reinforcing metal to a'series of acidbaths containing metallic salts. the plunging of the metal aftertreatment into a bath of molten metal. such as will molecularl unitewiththe hahbitt. and the casting of the hahhitt upon the coated surface.

In testimony whereof I afiix my signature in presence of two witnesses.

' \VILLIAM II. LUHRS.

'itncsses:

JAMES l. lhmn Au'rmiu I). Prm'uu.

